Mate, your questions depend very much on which fleet you will be employed on...
At this time, the ERJ 145 is due to retire by 2010 and so the chances are youll go to the EMB170...
As for the EMB170, you get about 10-12days off a month, more or less, about 7-10 overnights.
Under the new deal now, you have to pay for your TR, deducted from pay over 6yrs...
LOT and Centralwings... forever problems, who knows whats going to happen, presently talking about mergering the 2.
Hotels vary from Novotels, to av 3 star accom.
More day trips, there and back then overnight.
Training is good, held, well again depends on type, the emb170 is at Helsinki or UK somewhere at the moment.
Get hired? Usual exams, apptitude tests ect, nothing out of the norm. A Psych assesment that lasts 6hrs, and a panel interview...
Not much hiring going on at the moment. However next recruitment is in a couple weeks, think only taking on around 12 pilots.
FAA ATP? Dont think so mate

Need the JAA or they wont look at you. That may work at Eurolot (Daughter ATR operator) but not at LOT.
Goodluck